An immense cave that has served as an outlaw's treasure trove, an underground dance hall, a nuclear fallout shelter, and much more.

A small "palace" and museum made of, and devoted entirely, to salt.

Of course the grave of JFK's assassin is surrounded by conspiracy theories.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.